Anti-IgLON5 disease: A case with intestinal obstruction and peripheral neuropathy.

IgLON5 autoimmunity is a novel antibody-mediated disorder characterized by serum and/or cerebrospinal fluid (CSF) positivity for IgLON5 antibody. Anti-IgLON5 disease mainly manifests as sleep disturbances, movement disorders and brainstem syndromes. In this study, we report the case of a patient with anti-IgLON5 disease who presented with abdominal distension, abdominal pain, intermittent dysuria and constipation, and intermittent lightning pain in the extremities, which are atypical of anti-IgLON5 disease and could easily lead to misdiagnosis. After performing autoantibody screening, we considered anti-IgLON5 disease. The patient was started on a course of immunotherapy with intravenous dexamethasone, intravenous immunoglobulin (IVIG) and oral azathioprine (Imuran). Following treatment, the manifestations nearly resolved. The clinical manifestations of anti-IgLON5 disease are diverse and may present in different combinations, which can easily lead to misdiagnosis. Early recognition and treatment of this autoimmune disease with immunosuppressive agents may lead to better outcomes.